Mechanism for imparting false twist to textile rovings



March 21, 1939.? F. cAsABLANcAs 2,151,263

MECHANISM FOR IMPARTING FALSE TWIST TO TEXTILE ROVINGS y Filed F'eb. 5, 1937 Patented Mar. 21, 1939 UNITED YSTATES PATENT orrics MECHANISM FOR IMARTING FALSE TWIST T0 TEXTILE ROVINGS Application February 3, 1937, Serial No. 123,917 v In Spain February 15, 1936 6 Claims.

'This invention relates to false twist mech-v anisms employed in spinning or roving machines for imparting a false twist to the roving which is being spun or drawn.

The invention is especially applicable to mechanisms of this type in which the toothed wheels or pulleys which operate the individual twist tubes of the machine are, in their turn, driven by means of a transmission chain or belt, by means of a series of toothed wheels mounted on a common shaft, or by other means which ren- Y ly small diameter, which renders the operation oi passing the roving through the twist mechanism difficult, since the fingers cannot be inserted in the twist tube in order to pass the roving and it is necessary to use special tools or instruments vfor doing this.

` The improvements forming the subject of the present invention have for their chief object the provision of a false twist mechanism of the aforesaid type which is of extremely light and strong construction and in which the twist tube is used also as threading-in member for passing the roving through the twist mechanism. Y

A second object of the invention is to provide a driving connection for effecting the rotation of the twist device when the latter is in position in the twist mechanismjwhile allowing the said twist device to be withdrawn readily from the mechanism when desired.

A further object is to provide such a driving connection which is so constructed that, upon rotation of the twist tube being impeded, the said connection is automatically rendered inoperative thereby preventing damage to the apparatus and alsoy facilitating the removal of the twist device.

Yet another object of the invention is the provision of a false twist mechanism having a removable twist device wherein, upon the twist deof the roving is automatically gripped by a pair of drawing rollers or the like mounted adjacent the twist mechanism.

In order that the said invention may be clearly understood and readily carried into effect the same will now be more fully described with refs erence to the accompanying drawing in which:

Figrue 1 is a cross-sectional view of the false twist mechanism shown in conjunction with an endlessbelt drawing mechanism,

Figure 2 is a detail in section through the drivlo ing wheel which surrounds the twist tube, and

Figure 3 is an exterior side view of the twist tube.

The mechanism illustrated in Figure 1 comprises a driving shaft l which extends over the Aentire length of the machine and which carries, for each of the false twist mechanisms, a helical pinion 2, which drives a second helical toothed wheel 3, inside which is mounted the false twist tube 4. The pinions 2 are keyed on the spindle 2o l, so that when the machine is in operation the wheels 3 of the different twist mechanisms rotate continuously and the movement of one of them cannot be arrested without interrupting the rotation of the other'wheels. 25

The false twist tube 4 feeds the roving to the belts 5 of the drawing mechanism which belts are actuated by the cylinders 6 in the known manner.

In the construction illustrated in the drawing, 30 the hub l0 of the wheel 3 rotates within a bearing l, which is secured to a frame 8 which is in turn supported by a bar 9 suitably mounted in the machine.

The twist tube 4 is of relatively small diameter 3 and is disposed inside the hub I0 of the wheel 3, and in order to ensure the transmission of the drive from the wheel 3 to the tube 4 there is provided between the two a driving connection which, in thev construction illustrated in vthe 40 drawing, comprises a stop or projection Il formed on the hub ill and a corresponding projection l2 formed on the tube 4,. Thus, the tube 4 is simply introduced inside the wheel 3 and upon its reaching the operative position illus- 4" trated in Figure l, the stop ll of the wheel engages the stop l2 and thus drives the twist tube.

These stops are preferably so formed that their side surfaces are bevelled as is shown in the drawing, the object being to ensure that, should for any reason the rotation of the tube 4 be impeded, the bevelled faces of the two stops ll and l2 cause the tube 4 to be displaced axially towards the right of Figure 1 until the stops disen- 55 gage when the wheel 3 can continue to rotate without driving the tube 4.

This greatly facilitates the threading of the y roving. To thread the roving it is sufficient to grasp the projecting part I3 of the tube 4 by hand and to withdraw it from the wheel 3, whereupon the roving can be introduced into the tube 4, being passed through the longitudinal slot I4 in this tube, so that a short length of roving extends through the end of the tube. 'I'he tube 4 with the roving is then simply reintroduced into the wheel 3. When the stops II and I2 come into contact the tube 4 is rotatedr by the wheel 3 and at the same time, since the tube extends very close to the belts 5, the length of roving which extends beyond the tube is engaged by these belts and thus the mechanism is automatically threaded.

As will be understood, the driving connection need not be formed by the two stops II and I2 precisely as illustrated in the drawing, but other .arrangements may be adopted. For example one of theY two parts, such as the wheel 3 may be formed with a recess or aperture for engagement with the stop I2 of the other part. It would be preferable in this case also for the edges of theA stop and ofthe recess or aperture to be bevelled Y so that if the movement of the tube 4 is impeded the mechanical connection between the two parts may bebroken by the sliding of the tube 4. y What I claimand desire to secure by Letters Patent of the United States is:

1. In mechanism for imparting false twist to textile rovingsv the combination of a rotatably mounted member formed with an axially extend- `ing aperture and with a recess formed with at least one bevelled face, means for rotating the said member, and a false twist tube removably supported within the said member, said false twist tube being slotted along its length and formed with a projection which is adapted to enter into the saidV recess when the twist tube is in position Within the 'rotatable member and to be engaged by the said bevelled face of said recess to transmit the rotation of the said member to the said ltwisttube vsaid twist device being freely slidable longitudinally within the said rotatable member whereby upon rotation of the twist tube being impeded said twist tube is caused to slide longitudinally under the action of` the said bevelled -faceA on the said projection to disengage said projection from the said recess to render inoperative the driving connection between the rotatable member and the twist tube.

2. In mechanism for imparting false twist to textile rovings the combination of a bearing member, a hollow sleeve member rotatably mounted within said bearingmember and formed with a v recess at one of its ends, means for rotating the vsaid sleeve member, and a `false twist tube until the said flange engages the end of the said sleeve'member, to be engaged in said recess to transmit the rotation of the sleeve member to the twist tube, said recess and said projection each being formed with a pair of bevelled faces whereby upon rotation of the twist tube in either Adirection `being impeded, said twist tube is caused to slide longitudinally within said sleeve by the action of one of the bevelled faces of said recess on one oiu the bevelled faces of said projection to disengage said projection from said recess to render inoperative the driving connection between the rotatable member and the twist tub.

3 In mechanism for imparting false twist to textile rovings the combination of a member Ymounted for rotation about a generally horizontal axis and formed with an axially extending aperture and with a shoulder, means for rotating the said member, and a false twist device adapted to be inserted into the aperture in and to be supported by said member, said false twist device being slotted along its length and formed with a Cil shoulder which is'adapted, when the twist device f is introduced to the maximum extent into the rotatable member to be engaged by the said iirstnamed shoulder to transmit the rotation of the said member to the. twist device, the arrangement being such that the twist device continues to be a-nd to be supported by the sleeve member, one of said members being-formed with a recess and the other of said members being formed with a projection adapted to enter into the said recess when the false twist member is fully introduced into the sleeve member, the arrangement being such that the sleeve member continues to support the false twist member after the latter has been withdrawn sumciently `to disengage the projection fromvthe recess to interrupt the driving connection between the two members.A

5. In mechanism for imparting false twist to textilefrovings the Vcombination of a rotatably mounted member formed with an axially extending aperture, means for rotating the said ,memberg and a false twist member `slotted along its length and removably'Y supported within the said rotatable member, Vone of said members being formed with a recess having at least one bevelled face and the other of said members'being rformed with a projection which is adapted to enter into the said rece-ss when the twist member is in position within the said rotatable member and to be engagedY by the bevelled face of said recess to transmit the rotation of the sleeve'member to the twist member, said twist member being freely. slidable longitudinally within the said rotatable'member whereby upon rotation' of the said twist member being impeded it is caused to slide longitudinally under the 'action of the said bevelled face on the said projection to `disengage said projection from the said recess to render inoperative the driving connection between the said rotatable member and the twist member.

- and to `be supported by'said sleeve member while being slidable longitudinally therein and cooperating means-on the sleeve member and on the respect to the speed of rotation of the sleeve member whereby the tube may be shifted axially by said cooperating means, said tube having means whereby the tube may be slackened in speed or stopped.

FERNANDO CASABLANCAS. 

